JP2000288316A - Precision filter apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with excessive labor for sludge treatment in such a case that an individual precision filter device is connected to a filter apparatus performing the separation and filtration of a chip and cutting oil by a piping. SOLUTION: In the precision filter apparatus, sewage containing sludge and cutting oil is precisely filtered to be made reusable. In this case, a tank main body 2 for temporarily storing the sewage, which is supplied under predetermined pressure, under almost atmospheric pressure by introducing the sewage into a tank while allowing the same to flow out to the outside from an open port 20 opened to the atmosphere, a filter drum 5 having a filter 9, which prevents the fixing and growth of sludge by ejecting sewage from an ejection pipe under high pressure, provided to the outer peripheral surface thereof and rotationally driven in the tank and a negative pressure generating pump sending out a precisely filtered liquid to the outside of the tank main body 2 by evacuating the filter drum, are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microfiltration apparatus, for example, to filter a liquid from a contaminated liquid mixture of a liquid and a solid after use in various industrial machines so that the liquid can be reused. The present invention relates to a microfiltration device.

[0002]

2. Description of the Related Art Conventionally, a cutting oil which contains chips after use of metal cutting is separated into chips and cutting oil to make it reusable (hereinafter referred to as "purifying cutting oil"). To tell)
There have been proposed many filtration devices for obtaining the same.

[0003] According to such a filtering apparatus, it is possible to separate cutting chips and liquid cutting oil, but it is not possible to separate fine solids such as grinding stones generated by grinding. Therefore, a fine filtration device for performing such fine filtration of fine solids may be separately provided in the filtration device.

[0004] As such a microfiltration apparatus, Japanese Patent Application Laid-Open No.
There is a filter device as disclosed in JP-A-172321. According to this device, a filtration drum formed by laminating thin plates is provided on the outer peripheral surface, and a filter drum is rotated in a tank, and furthermore, an atomized polluted liquid sprayed on the outer peripheral surface of the filter drum from an injection pipe. While filtering, bad fuel and the like are filtered by a filtration drum.

Further, there is a rotary filtration device as disclosed in Japanese Utility Model Laid-Open No. 6-24707. According to this device,
The filter drum provided with the sintered metal filter on the outer peripheral surface is rotated in the tank, and the outer peripheral surface of the filter drum is washed with high-pressure water injected from the injection pipe. While removing the purified water filtered by the suction unit communicating with the inside of the filtration drum,
The sludge separated by the filtration filter is collected.

[0006]

However, according to the apparatus disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 60-172321, the inside is at the same pressure as the inlet, so that the cleaning effect is low.
Further, since the filter is formed by laminating thin plates, it is necessary to periodically perform an operation for eliminating clogging. Further, according to the apparatus disclosed in Japanese Utility Model Laid-Open Publication No. 6-24707, it is troublesome to periodically take out the separated and recovered sludge outside the apparatus. For this reason, when separately provided for the apparatus for separating and filtering the cutting chips and the cutting oil as described above, extra work is required for sludge treatment.

Accordingly, the present invention has been made in view of the above points, and an object of the present invention is to provide a microfiltration device provided separately for a device for separating and filtering chips and cutting oil. An object of the present invention is to provide a microfiltration device that does not require extra labor for sludge treatment.

[0008]

In order to solve the above-mentioned problems and achieve the object, according to the present invention, fine solids containing sludge and liquid containing cutting oil are used in industrial machines. A microfiltration device for microfiltration of a turbid contaminated liquid to make the liquid reusable, wherein the contaminated liquid supplied at a predetermined pressure is discharged to the outside from an open part opened to the atmosphere. By introducing the inside of the tank, the tank body for temporarily storing the contaminated liquid at substantially atmospheric pressure, and a filtration filter for preventing the solid from sticking and growing by injecting the contaminated liquid from an injection pipe. On the surface,
A filtration drum that is driven to rotate inside the tank, and a unit that generates a pressure difference between the inside and the outside of the filtration drum, and that sends out the liquid that has been finely filtered to the outside of the tank body. Features.

In addition, the contaminated liquid is introduced into the tank via the injection pipe, and the injection pipe is disposed toward the surface of the filtration drum.

[0010] Further, the invention is characterized in that the spray pipe and the filter drum are surrounded inside the tank, and a wall member communicating with the opening is provided.

Further, a stirring member for stirring the inside of the tank is fixed to an outer peripheral surface of the filtration drum.

The industrial machine is a machine tool for cutting or grinding, the solid is a cutting powder or a grinding powder, and the liquid is a cutting fluid or a grinding fluid. I have.

It should be noted that the present invention is not limited to the embodiments described below, and it goes without saying that various configurations are possible within the scope defined by the appended claims.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a central sectional view showing a main part of the microfiltration apparatus 1. FIG. 2 is an example of a piping diagram between a filtration device 100 used together with the precision filtration device 1 and processing devices 200 and 201 of a machine tool or a grinding machine.

In both figures, the microfiltration apparatus 1 piped in this manner is used for cutting or grinding in the processing apparatuses 200 and 201. Is typically used together with a filtration device 100 for filtering water to obtain purified cutting oil.

The schematic configuration is not limited to the filtering device 100 for a machine tool, but is a food machine for separating oils and fats from solids, and a civil engineering machine, which is capable of removing soil and sand corresponding to particle size from polluted liquid mixed with earth and stone. Can also be applied to the case where is obtained by filtration.

First, in FIG. 2, the filtration device 100 is provided with a liquid tank for storing purified cutting oil.
By supplying a purified cutting oil at a predetermined pressure into the microfiltration apparatus 1 through a pipe 23 connected to the pipe 2, sludge such as falling whetstone powder generated by grinding can be microfiltered. The microfiltration device 1 is provided with a pipe 25 for sending the overflowing purified cutting oil to the pollution treatment tank side of the primary treatment filter as described later.

Further, a pipe 24 is connected to a negative pressure generating pump 26 which makes the inside of the filtration drum 5 of the microfiltration device 1 a negative pressure as described later. A pipe 27 is connected to the positive pressure side of the negative pressure pump 26 so as to send the microfiltered liquid to the machine tool 201. Further, the purified cutting oil that is not subjected to the microfiltration is sent to the machine tool 200 by the pump 22 so that it can be used for rough machining. Alternatively, there is a case where the sheet is not directly sent to the machine tool but sent via a clean tank.

Next, referring to FIG.
The contaminated liquid containing the sludge supplied at a predetermined pressure through 3 is supplied to the inside of the tank main body 2 via the injection pipe 6 or is introduced into the tank main body directly from a supply pipe (not shown). You.

On the other hand, the lower part of the tank body 2 is closed by a base 3 as shown in the drawing, and a wall member provided to temporarily store the contaminated liquid therein and then divide the inside of the tank. Atmospheric pressure opening 20 overflows the upper end of 19
Then, the contaminated liquid continuously supplied via the injection pipe 6 is circulated between the filtration device by returning to the filtration device via the pipe 25. It enables continuous operation.

A filter drum 5 is provided inside the tank body 2 so as to be rotatable about a shaft 8 as a rotation axis inside the tank as shown in the figure. For this purpose, the upper and lower portions of the shaft body 8 are rotatably supported by the bearing 11 provided on the flange member 14 and the bearing 11 provided on the base 3, while a seal such as an O-ring is provided in the middle of the shaft body 8. The provision of 15 prevents liquid leakage to the outside. The upper end side of the shaft body 8 supported in this manner is fixed to an output shaft of a geared motor 17 via a joint 16 as shown in the figure.

A perforated metal 10 which forms the outer peripheral surface of the filtration drum 5 is provided on the outer peripheral surface of the filtration drum 5, and a filtration filter 9 having a desired filtration ability having a sludge filtration ability is provided thereon. It is fixed via a mesh (not shown). By fixing the filtration filter 9 in this manner, a space is provided between the mesh body and the punching metal 10 so that a hole is formed when the filtration filter 9 comes into close contact with the punching metal 10 due to a differential pressure effect described later. The entire surface of the filter 9 can be filtered without blocking the portion 10a.

The lower end of the filter drum 5 is sealed by a V-seal 13 having a V-shaped cross section, which is a kind of rubber seal, so as to be watertight with respect to the tank body 2. The filtration drum 5 further has an outlet 2 provided in the base 3.
An opening 12 communicating with the outlet 1 is formed.
The inside of the filtration drum 5 is configured to have a negative pressure by a negative pressure pump 26 connected to the filter drum 5 via a pipe 24.
Alternatively, the pressure is released to the atmospheric pressure to generate a differential pressure.

In some cases, a stirring plate 18 for stirring the inside of the tank is further provided on the outer peripheral surface of the filtration drum 5 so as to prevent sludge from settling inside the tank.

The operation of the above arrangement will be described with reference to FIGS.

The contaminated liquid supplied by the pump 22 via the pipe 23 is supplied to the inside of the injection pipe 6 in the direction of arrow D1 at a pressure of about 2 kg / cm 2,
Is jetted vigorously toward the filtration filter 6. As a result, sludge and the like remaining on the surface of the filtration filter are blown off to prevent clogging of the filtration filter. The contaminated liquid introduced into the tank body 2 in this manner eventually approaches a full state, overflows the upper end of the wall member 19, and flows out to the atmospheric pressure release section 20, so that the inside of the tank is maintained at atmospheric pressure. Will be done. Alternatively, some pressure may occur.

During this time, the filter drum 5 is sucked into the drum by negative pressure (around 100 mmHg) while being rotationally driven in the direction of the arrow.

The above-described series of operations are continuously repeated to obtain a microfiltrate from which sludge has been removed, so that the microfiltrate is sent in the direction of arrow D2 and can be used in the processing machine 210 described above. Alternatively, it is filtered only by the gravitational action of the liquid.

The contaminated liquid discharged from the atmospheric pressure opening 20 in the direction of arrow D3 is returned to the filtration device.

By operating as described above, the sludge constantly circulates and thus does not settle, thereby enabling a maintenance-free continuous day and night operation.

FIG. 4 is a cross-sectional view of the microfiltration device.

In this figure, the same reference numerals are given to the components already described and the description is omitted. The wall member 19 surrounds both the filtration drum 5 and the injection pipe 6 in the tank body 2. And the inside of the tank is provided with a filtration unit 2a.
And an overflow part 2b.

On the other hand, a nozzle or fan-shaped member 30 for directing the contaminated liquid in a substantially tangential direction opposite to the direction of rotation of the filtration drum indicated by an arrow is fixed to the hole 6a of the injection pipe 6. In addition, an injection pipe is provided so as to inject the filter drum in a direction other than the tangential direction.

According to the above configuration, the tank main body 2 can be made cylindrical as shown in the figure, so that it is possible to cut the pipe material and manufacture it at low cost. Further, since the filtration can be performed by applying a negative pressure to the filtration filter, it is possible to make the filter considerably smaller at least in comparison with the filtration device.

On the other hand, in a conventional negative pressure type filtration device,
Since the negative pressure or pressure difference acts directly inside the tank, the cost has increased due to the need to improve the pressure resistance.However, this device has a structure that opens to atmospheric pressure as described above, so the tank body is the minimum required. Good strength and low cost.

Further, since the microfiltrate can be directly supplied to the machine tool 201 through the pipe 27 as described above, a secondary tank for sludge sedimentation as in the related art can be dispensed with, thus saving space. Can greatly contribute to

[0038]

As described above, according to the present invention, when a microfiltration device is individually connected to a filtration device that separates and filters cutting chips and cutting oil by piping, unnecessary sludge treatment is required. It is possible to provide a microfiltration device that does not require labor.

[Brief description of the drawings]

FIG. 1 is a center sectional view showing a main part of a microfiltration device 1.

FIG. 2 is a filtration device 1 used with the microfiltration device 1.
00 and a processing device 200, 2 of a machine tool or a grinding machine.
FIG.

FIG. 3 is a diagram illustrating the operation of the microfiltration device.

FIG. 4 is a cross-sectional view of the microfiltration device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Precision filtration apparatus 2 Tank main body 3 Base 5 Filtration drum 6 Injection pipe 8 Shaft 9 Filtration filter 17 Geared motor 19 Wall member 20 Atmospheric pressure opening 21 Outlet 22 Pump 26 Negative pressure pump

Claims (5)

[Claims] 1. A microfiltration device for use in an industrial machine, which microfiltrates a contaminated liquid in which a fine solid including sludge and a liquid including cutting oil are turbid, and makes the liquid reusable. By introducing the contaminated liquid supplied at a predetermined pressure into the tank while allowing the contaminated liquid to flow to the outside from an open part opened to the atmosphere,
A tank main body for temporarily storing the contaminated liquid at substantially atmospheric pressure, and a filtration filter for preventing the solids from sticking and growing by spraying the contaminated liquid from an injection pipe, on the outer peripheral surface; A filtration drum that is driven to rotate at a pressure, and a unit that generates a pressure difference between the inside and the outside of the filtration drum and that sends out the liquid that has been microfiltered to the outside of the tank body. Filtration device. 2. The precision according to claim 1, wherein the contaminated liquid is introduced into the tank via the injection pipe, and the injection pipe is disposed toward a surface of the rotary drum. Filtration device. 3. The microfiltration apparatus according to claim 2, wherein a wall member that surrounds the injection pipe and the filtration drum inside the tank and communicates with the opening is disposed. 4. The microfiltration apparatus according to claim 1, wherein a stirring member for stirring the inside of the tank is fixed to an outer peripheral surface of the filtration drum. 5. The industrial machine is a machine tool for cutting or grinding, the solid is cutting powder or grinding powder, and the liquid is a cutting fluid or a grinding fluid. The microfiltration device according to any one of claims 1 to 4.